Mineral Information and Data:

Swinefordite
Ca0.2(Li,Al,Mg,Fe)3(Si,Al)4O10(OH,F)2 • nH2O [CNMNC approved formula]

Named for Ada Swineford (1917-1993), clay mineralogist and professor of geology at Western Washington State College, Bellingham, Washinton, USA.

IMA status : Approved Species 1975 ()
CLASSIFICATION 
Dana
(8th edition) :
71.03.01a.05  
  (71) Phyllosilicate Sheets of Six-Membered Rings
  (71.03) with 2:1 clays
  (71.03.01a) Smectite group (Dioctahedral Smectites)
  
Nickel-Strunz
(10th edition) :
09.EC.45
  (09) Silicates
  (09.E) Phyllosilicates
  (09.EC) Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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